...or how I made a cock-up.


Sometime back I put in a new window but now realise that I cocked up the DPM.  I should have wrapped it vertically up the inside face of the stone cill.  But I didn't.  So water gradually accumulates between the DPM and the stone cill and then pools onto the top of the dwarf wall and we get damp coming through the plaster.

I could Synthaprufe the internal face of the dwarf wall but would rather try and stop the water coming in in the first place.  But cant really see a good way forward. If the existing DPM was dry then I could try applying a load of gorilla glue onto a second piece and sliding that in between the existing DPM and the stone cill.  But it isn't.  Expanding foam ?

Any suggestions very welcome.  TIA